Mill River Unified Union School District consists of five public schools: Clarendon Elementary School (CES), educating studen ... ts Pre K - 6th grade in North Clarendon, VT Mill River Union High School (MRU), educating students grades 7-12 in South Clarendon Shrewsbury Mountain School (SMS), educating students Pre K - 6th grade in Shrewsbury VT Tinmouth Mountain School (TMS), educating students Pre K - 6th grade in Tinmouth VT Wallingford Elementary School (WES), educating students Pre K - 6th grade in Wallingford, VT read more